X0306 4 2022-03-21 0 0001538210 NexImmune, Inc. NEXI 0001247015 BARER SOL J C/O NEXIMMUNE, INC. 9119 GAITHER ROAD GAITHERSBURG MD 20877 1 0 0 0 Common Stock 2022-03-21 4 P 0 30000 2.136 A 1477814 D Common Stock 1538013 I Held by B&S NexImmune Holdco LLC Common Stock 346577 I Held by Joshua Barer The price reported is a weighted average price. These shares were purchased in multiple transactions at prices ranging from $2.05 to $2.235, inclusive. The reporting person will provide to the staff of the Securities and Exchange Commission, the issuer, or any security holder of the issuer, upon request, full information regarding the number of shares purchased at each separate price. Excludes 175,012 shares of common stock underlying options that are currently exercisable. Mr. Sol Barer is the father of Joshua Barer, who is the sole manager of B&S NexImmune Holdco LLC and has sole voting and dispositive control over the shares held by B&S NexImmune Holdco LLC. Mr. Sol Barer is also a member of Barer & Son Capital, LLC, which is a member of B&S NexImmune Holdco LLC, but he does not have voting or dispositive control over the shares held by B&S NexImmune Holdco LLC. Mr. Sol Barer disclaims beneficial ownership of the securities held by B&S NexImmune Holdco LLC except to the extent of his pecuniary interest therein. Mr. Sol Barer is the father of Joshua Barer. Mr. Sol Barer disclaims beneficial ownership of the securities held by Joshua Barer. /s/ Andrew Pearce, Attorney-in-fact 2022-03-22